NAT TYPE Help needed

I am in desperate need of some help with my NAT TYPE problem. The problem is, I have 3 PS3's in the same house working off of a wireless network. The router is a linksys. We haven't had any troubles until we started playing COD Ghosts. One of us might have an OPEN NAT, the other a STRICT NAT and the other a MODERATE NAT. I'm not sure why this is happening. I don't understand how to open all of the ports for 3 different PS3's. Can anyone help me?

Re: NAT TYPE Help needed

I checked to see if my ps3's have static IP's and they do. So that isn't the problem. I believe the problem is that the ports aren't open for each ps3, but I can't figure out how to open them for multiple ps3's.